David Williams (asker) Jul 2, 2012:

Yes, I see what you mean although if it were merely necessary for the components to be connected to the electric circuit, the size/surface area of the connection wouldn't make much difference, would it?

Colin Rowe Jul 2, 2012:

I believe this still refers to the electrical contacts. No "Anodisierung" occurs at the "Kontaktstellen" because the electrical contacts are in the way. A bit like if you hold an object between finger and thumb whilst spray-painting it. The area between finger and thumb will remain uncoated.
Nor do I believe that there is a contradiction. The "Kontaktflächen", i.e. the areas where the electrical contacts are connected, must be as small as possible, but as large as necessary. Taking the finger and thumb image again: if the object you are spray-painting is larger, you might need to hold it with your whole hand. The "Kontaktfläche" will be larger, but the area that remains unpainted will obviously also be larger.

David Williams (asker) Jul 2, 2012:

Actually they do need to be touching each other, not simply connected to the electric circuit, i.e. "Für eine ausreichende Kontaktierung ist zu sorgen. Da an den Kontaktstellen keine Anodisierung stattfindet, sollten diese nur so groß wie nötig sein" or "Je größer die zu anodisierende Fläche, desto größer muss die Kontaktfläche sein", even though these two sentences seem to be rather contradictory.

Colin Rowe Jun 29, 2012:

I don't think they need to be touching each other, just wired up (i.e. electrical contacts) to carry a current.

pj-ffm Jun 29, 2012:

I would just say "make sure that the components make/are in contact with each other"